System Shutdown Switch Connected to Backup Gateway

As noted in STEP 7: Install System Shutdown Switch, a System Shutdown Switch can be wired to the Powerwall+ solar assembly to manually initiate Rapid Shutdown (RSD) to disable solar output and simultaneously command all battery assemblies and Powerwall 2 units to enter a safe mode.

The switch can also be connected to the Backup Gateway AUX terminals, although this method does not meet RSD requirements. The following section outlines system behavior when the System Shutdown Switch is connected to the Backup Gateway, as well as instructions for wiring the switch.

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Note
Beginning with Powerwall software version 21.39.1, all shutdown switches (including the external System Shutdown Switch described here) will shut down all CAN-connected components when activated. The following table defines System Shutdown Switch behavior for systems on software version 21.39.1 or later; for systems on software versions earlier than 21.39.1, see Rapid Shutdown Initiation
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Note
Turning the Enable switch on each Powerwall+ OFF will also shut down all equipment.
Table 1. System Shutdown Switch Function
Action System Behavior
Turn Switch to OFF (open) Position
  • Solar output is disabled for any unit connected to the switch
  • All Powerwall+ battery assemblies and Powerwall 2 batteries go idle
Turn Switch to ON (closed) Position The solar assembly performs a system self-test and then resumes operation
AC Grid Present AC Grid Not Present (Off-grid or AC Grid is Down)
Normal system operation will resume shortly Battery operation may only resume when the grid is back or a 12V jump start is provided to the Gateway
Warning IconA warning icon, calling your attention to a possibly risky situation
CAUTION
Before performing maintenance on the system, use a multimeter to check for voltage after shutting down equipment to ensure the system is in a safe state.

Connect the System Shutdown Switch to the Backup Gateway

To wire the System Shutdown Switch to disable all solar output and command all battery assemblies and Powerwalls to a safe mode, connect the switch to the Backup Gateway:
  1. Remove the factory-installed jumper from pins 1 and 2 of the 5-position “AUX” connector inside the Gateway 2. See Appendix B for a diagram of the connector location.
  2. Using minimum 24 AWG conductors, with wiring methods according to code, connect pins 1 and 2 (labeled “SDO” and “SDI”) to a suitable disconnect switch (requirements below).
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Note
To meet RSD requirements the switch must be connected to the solar assembly RSD IN/OUT terminals (not the Backup Gateway AUX terminals).
Informational PurposesAn informational icon, calling your attention
Note
For switch requirements, recommended components, and installation guidelines, see STEP 7: Install System Shutdown Switch.